feat(billing): implement US-3.7 billing and subscription UX with detailed dashboard, real-time invoice history, inline paywall and upgrade confirmation

memento-note/locales/en.json

@@ -2922,6 +2922,13 @@
     "secureTransactions": "Secure transactions",
     "satisfactionGuarantee": "30-day satisfaction guarantee"
   },
+  "quotaPaywall": {
+    "title": "Monthly limit reached",
+    "description": "You've used all your {feature} credits for this month.",
+    "upgrade": "Upgrade plan",
+    "useOwnKey": "Use your own API key",
+    "later": "Maybe later"
+  },
   "landing": {
     "nav": {
       "features": "Features",